Answer:
A: The first one because it is going upward and that means getting warmer.
B: The second one is the cooling curve because it is going downward and that means cooler.
Explanation:
I hope this helps.
Answer:
When 22.0 g of water is heated from 17 °C to 100 °C what amount of heat absorbed?
When 22.0 g of water is heated from 17 °C to 100 °C water absorbed 7643.64 j heat.
Explanation:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Given data:
Mass of water = 22.0 g
Initial temperature = 17°C
Final temperature = 100°C
Solution:
ΔT = T₂ -T₁
ΔT = 100°C - 17 °C= 83°C
Q = m.c. ΔT
Q = 22 g× 4.186 j/g °C × 83 °C
Q = 7643.64 j
It means water require more heat which is 7643.64 j to increase its temperature from 17 °C
to 100 °C
.
Answer:
2Na2O (s) → 4Na (s) + O2 (g)
Explanation:
According to this question sodium oxide, Na2O, decomposes to produce oxygen gas, O2, and sodium metal, Na. The following represents the chemical equation;
Na2O (s) → Na (s) + O2 (g)
However, the above chemical equation is not balanced as the number of atoms of each element on both sides are not equal e.g. there are 2 moles of Na on one side and 1 mole on the other.
To balance the equation, we make use of coefficients to ensure that the atoms of each element on the reactant side are the same as that on the product side. The balanced equation is as follows:
2Na2O (s) → 4Na (s) + O2 (g)
Answer:
0.307
Explanation:
use the formula of n=mass /molar mass
